<?php
    

    header('content-type:text/html;charset=utf-8');
   

    $conn = new mysqli('localhost', 'root', '105776', 'sy2006');


    $username = $_POST['username'];
    $Focus_secondHands = $_POST['Focus_secondHands'];

  
    $sql = "UPDATE `user` SET `Focus_secondHands`='$Focus_secondHands' WHERE `username`='$username'";
    mysqli_query($conn,$sql); 

    
?>
